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<?php
namespace Desmond\functions\core;
use Desmond\functions\DesmondFunction;
use Desmond\ArgumentHelper;
use Desmond\exceptions\ArgumentException;
class Cons implements DesmondFunction
{
use ArgumentHelper;
public function id()
return 'cons';
}
public function run(array $args)
$this->testArguments($args);
$newList = $this->newReturnType(
$this->collectionType($args[1]), [$args[0]]);
$oldList = $args[1];
foreach ($oldList->value() as $value) {
$newList->set($value);
return $newList;
public function collectionType($collection)
return $this->isDesmondType('List', $collection) ? 'List' : 'Vector';
private function testArguments(array $args)
if (count($args) !== 2) {
throw new ArgumentException('"cons" expects 2 arguments.');
$this->expectArguments(
'cons',
[1 => ['List', 'Vector']],
$args
);
Archer70 /
desmond
